If you want to prevent bats entering Maine homes, then you need to know what’s causing bats to get in a Maine home

If you want to prevent bats entering Maine homes you need to read this article! A bat flying around the house in the middle of the night can cause a lot of excitement and fear! Yet this story plays itself out many times in a Maine summer.

While all bat intrusions are on a case-by-case basis, some common themes exist in the Maine bat removal business. The time of the year is a clue in determining the type of bat problem.

First, we will explore why bats enter Maine’s homes’ living space, which will help you understand how to prevent bats entering Maine homes.

Photo: Bats in an attic at the blog post Prevent Bats Entering Maine Homes!.

This small colony of bats took up residence in this Maine attic during the cold months. 

Young bats or bat pups entering Maine homes

We see two species of Maine bats: Little Brown and Big Brown. After the little brown and big brown bat pups are born, they will be flightless and feed on their mother’s milk for 3 to 5 weeks. When they get larger, they start to venture away from their mother, which eventually leads to their taking flight. Young bats just learning to fly end up in places they shouldn’t so you need to know how to prevent bats entering your Maine home!

We start seeing this period in Maine between the second week of July and approximately the second week of August. During this time in the bat business, the proverbial all hell breaks loose happens, and the calls with bats in homes go way up. The young ones are exploring their environment and going places that older, more experienced bats don’t go.

Photo: A baby little brown bat at the blog post Prevent Bats Entering Maine Homes! Thanks to Austin Waag, Public domain, via Wikimedia Commons.

Little Brown Bat Baby(Pup)

Photo: A big brown bat at the blog post Prevent Bats Entering Maine Homes!  Thanks to USFWSmidwest, Public domain, via Wikimedia Commons.

Mature Brown Bat

Are young Maine bats accidentally getting in the house or using the home as a roost?

First, to clarify. A roost is a place where bats live. Generally, male and female bats do not live together. So, a roost could be just male or female bats.

Female bats will gather without males in a roost to give birth and raise their young. This type of roost is called a maternity colony.

So when a bat enters a house, there could be a male roost inside the home or a female roost or maternity colony inside your home.

If it’s mating season, male and female bats could be temporarily together. Also, if it is winter in Maine, male and female bats may be hunkering down in a home, which is generally an attic, hibernating.

We have seen handfuls of bats, up to hundreds of bats, living in a Maine attic. If multiple bats in a given year or some bats year after year find their way inside, this may be a tip-off that the Maine house is a roost. The other possibility is that a rogue bat accidentally got inside, and most rogue bats are young bats, but not all.

Photo: A big brown bat under a roof eve at the blog post Prevent Bats Entering Maine Homes!

This bat worked its way into the attic via this small opening under the shingles and roof.

Photo: A bat on the outside of a home at the blog post Prevent Bats Entering Maine Homes!

If you see a bat hanging out on the outside of your building you probably have bats.

Will Maine bats get in around window air conditioners?

Well, yes and no. All window air conditioners should be looked at so as not to allow any gaps large enough for a bat to get through. A 3/8 by 1-inch gap is large enough for a bat to fit through.

Here’s a big tip to remember. Always put foam or some blocking between the top of of the pushed up window inside the home. Bats can enter when foam or block is not used or placed haphazardly. Since bats can sense the draft between the two windows with a gap, they will work their way in between and into the house.

Photo: A bat can enter gaps around an air conditioner at the blog post Prevent Bats Entering Maine Homes!

Will bats come down Maine chimneys or live in Maine chimneys?

When bats enter buildings, they don’t see holes as we do; instead, they sense drafts. It is an interesting site to see a bat enter a building. Usually, they fly around a hole and swoop towards the opening at the last moment, then scratch their way in.

Chimneys are always sending a draft out of a house, and that’s why bats will go down chimneys and be unable to find their way out many times. They will fly around the house, stuck behind the fireplace screen or inside a wood stove attached to the chimney flue.

We have witnessed bats living between the brick and chimney liner flue where there’s been a crack in the mortar large enough for the bats to enter. This hole can be as small as 3/8 to 1 inch wide to allow access.

On rare occasions, bats have also entered mostly older chimneys from the top and into the attic through a missing brick or mortar joint. And since Maine winters can be harsh on chimneys, checking your chimney for missing stones, bricks, or mortar gaps that will allow bats access later in the year is a good idea.

Photo: A excellently covered chimney at the blog post Prevent Bats Entering Maine Homes!

Even though this is an excellent top-of-the-line chimney repair that will keep larger critters out, the mesh is not narrow enough to keep bats out. Another layer of finer mesh is needed.

The Bottom Line On Bats Getting Into Your Home

To simplify this article, any 3/8″ x 1″ gaps in your home give access to bats. So, the bottom line is to have a professional bat exclusion expert check your building from top to bottom. They will be able to tell you where bat entrances exist and if you have bats in your home, and they will tell you how to remedy your bat problems.

So contact Midcoast Wildlife Specialists at (207) 295-0751, the premier bat service in Maine, which provides Maine bat exclusion with integrity, effectiveness, and expert knowledge.